The Nagasaki terror weapon (3)
I believe the answer is:
gas
'the' is the definition.
I can't tell whether this definition defines the answer.
'nagasaki terror weapon' is the wordplay.
'GAS' is hidden within the letters.
But, I am unsure how this is indicated.
Can you help me to learn more?
(Other definitions for gas that I've seen before include "person who's amusing ..." , "Hydrogen or methane, say" , "Oxygen is one" , "Something exciting" , "It's not liquid or solid, like American petrol" .)